When a service is an Add-On Service Only, there needs to be a way to bulk add it to base services directly from add-on service instead of having to go into each and every base service and add it individually. A service drop down menu in the services would be helpful so you can add it all at the base services at same time.

Allow add-on services to be added on to multiple services at once from a check all that apply screen, or apply o all, or multiple selection

Currently, it seems like the only way to add “add-on” services to a service is to select one at a time, opening the menu each time. If there was a way to check multiple services under that menu, it would make the process much more streamlined

For Services-When selecting which Services an "add-on" can be selected under you should make it so you can select multiple services instead of having to select one service at a time and then selecting "add another service". It would be better for instance if I had "toner" as an add on, when you go to Add-On Services

Select which add-on services can be paired with this base service. Once an add-on has been selected at booking, only service providers who can perform both the base and add-on service will be bookable.

Where you "add service, once in there you should be able to select multiple services and then add them!

Having the ability to ADD ON existing services with a dropdown menu Instead of having to completly type every description, price, duration, etc to ADD ON to another service would save so much time and frustration.

This feature is critical. Right now it's manual and leads to so many pricing and timing inconsistencies because you have to manually edit the add-ons with each service. It would not be hard to build this into the product and would save all of your customers HOURS of time and countless user errors because it's so tedious.

Please create a feature where you can create a group add-on and assign it to specific service. The way it is now takes up way too much time.